Control mechanism



Fr-WHITE AND]. B. BARDO.

CONTROL MECHANISM.

APPLICATION FILED JUNEIB. [9|].

Patented July 15, 1919.

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5114-00 utoz F. WHITE AND 1. a. BMW. CONTROL MECHANISM. APPLICATIIONFILED JUNE 18, l9l7- '1 ,309,926, Patented July 15, 1919.

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FL WHITE ANDJ. B. BARDO.

001111101 MECHANISM.

APPLICATION FILED JUNE f8 19!].

3140c nto'c W R/new r F W Patented Jul 15, 1919.

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an snares PATENT orrioa FIELD WHITE AND JOHN B. BARDO, OF DETROIT,MICHIGAN.

CONTROL MECHANISM.

Specification of Letters Patent.

Patented July 15, 1919.

Application filed June 18, 1917. Serial No. 17 5,267.

To all whom it may concern:

Be it known that we, FIELD IVHITE and JOHN B. BARDO, citizens of theUnited States of America, residing at Detroit, in the county of Wayneand State of Michigan,

have invented certain new and useful Improvements in Control Mechanism,of which the following is a specification, reference be- This inventionrelates to means for auto-v matically defining the length of cut orperiod of travel of a tool of the character described and includesautomatic reversing control.

The invention consists in the matters hereinafter set forth, and moreparticularly pointed out in the appended claims.

In the drawings,

Figure 1 is a View of a device embodying the invention applied to amultiple drill press;

Fig. 2 is a view in detail of a quick throw master switch that may beused with the device;

Fig. 3 is a view in diagram showing the connection between the masterswitch and a reversing switch together with the motor that operates thedrill press or other machine to which the device is applied, and

Fig. 4 is a View of a modification of the device.

As herein indicated, a rod 1 is secured to the part 2 of thetapoperating head or member which advances with the tap toward the work. Amaster switch 3 of any approved quick throw orsnap-action type has theoperating lever thereof disposed in the path of a pair of adjustablestops 5 which are carried by the rod 1. As one convenient form of switchthe member 4 may be one arm of a bell crank, the other arm of whichcarries a contact plate 6 which is snapped, after the member 4 has movedpast the pivot member, by a suitably devised spring 7 across either apair offorward contact points 8 or a corresponding reverse pair 9,

according to the advance or regression of the member 2 as the taps onthe spindles thereof work into or back away from the work.

The switch 3 controls through suitable circuits 1010 and 1110, areversing switch 12 of any preferred type adapted to control and reversea motor 13 that is positively connected through suitable means to thedrive shaft of the drill press. A cut off switch is also convenientlylocated to stop the motor.

In operation the spindles and taps are brought to the work by suitablemovement of the head 2, carriage or platen by the usual manual meanssuch as a hand wheel ll or the like and thereafter the taps drawthemselves into the work with the platen to a point where the stops 5throw the switch and reverse the motor thereby permitting or causing thetaps to back out and carry the member 2 with them until the motion isagain reversed by the action of the stops in throwing the master switch.

In order to avoid the necessity of turning the cut-01f switch 14: byhand to stop the machine from alternately feeding up and down, themodification shown in Fig. 1 may be used. In this instance a mastercontrolling switch 15 which may embody both the features of the switchesof the other device, that is, be a master and reversing switch in one,has its operating member 15 thrown by the stops 5 on thespindle 1 as inthe first instance. In addition, a pair of cut-out stops 17 areadjustably secured on another member- 18 to move with the machine heador platen and thereby throw a cut-out switch 19 off on the retrogrademovement of the machine. By this arrangement the machine may be set tostop itself at either limit of movement of the taps. Fig. 4: may also beconsidered as representing one of a line of machines having a common bed20 along which thework may be advanced and by proper adjustment of thecontrolling mechanism these machines may be regulated to feed insynchronism or in order as desired.

Consequently, machines of this type may be controlled by devicesembodying the invention to accurately feed and withdraw drills, taps orthe like to any predetermined depth without attention on the part of theoperator.

It, is also plain that the device may be used on any machine in whichvery accurate reversal of the feeding mechanism is desirfeeding machineand reversible electric mo-" tor positively driving the same, of areversing switch controlling the motor, a master switch controlling thereversing switch,

stops adjustably secured to reciprocating parts of the machine to movein synchronism with a longitudinal movement of the tool feeding part ofthe machine and arranged to throw the reversing switch at predeterminedpoints in either direct-ion ,of travel of the reciprocating parts.

2. The combination with a power drill press and reversible electricmotor positively driving the same, of a reversing switch controlling themotor switch, a master switch controlling a reversing switch, stopsadjustably secured to the reciprocating parts of the press to move insynchronism with the longitudinal movement of the drill spindle andarranged to throw the reversing switch alternately into reverse anddirect position at predetermined points in either direction of travel ofthe reciprocating parts and stops adj ustably secured to thereciprocating parts of the press to move in synchronism with thelongitudinal movement of the drill spindle and arranged to throw themaster switchvinto cut out position at either limit of movement of thedrill spindle, as predetermined.

In testimony whereof we aflix our signatures in presence of twowitnesses.

Witnesses O'r'ro F. BARTHEL, ANNA M. Donn.

